How many books does Kayla have?

Let $I$ be the number of books of Isabel and $K$ be the number of books of Kayla. Then

$I=3K$ , however, $I=12$ , therefore

$12=3K$

Divide both sides by $3$ to isolate $K$ , we have

$4=K$

or

$\boxed{K=4}$

12=3k 3k=12 3k÷3 & 12÷3 K=4

If Isabel has three times as many books as Kayla, Kayla has one-third as many books as Isabel, who has 12.

Thus, Kayla has $\displaystyle \frac{12}{3} = \boxed{4}$ books.

Therefore, the answer is 4 .

12 divided by 3 is 4. So the answer is 4

The equation for this problem looks like this: (the number of books Isabel has) divided by $3$ = (the number of books Kayla has), or $\frac{12}{3} = K = 4$ .